I had the same problem. Introvert and super shy, but I was asked to give talks. So I went to my aunt for advice who is a rhetoric teacher. Here's what she taught me:
It's all in the preparation. Read about storytelling and the hero's journey. Outline what you want to say. Then practice your talk ten times. You need to know your words by heart. If you practice it so many times, it will get easy. Don't record yourself, that will only depress you. And always remember: you know something others don't, that's why you do the talk in the first place. Be proud of yourself!
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